Type bar releasing mechanism for typewriters



Sept. 30, 1952 A. GlSSEL ET AL 2,612,252

TYPE BAR RELEASING MECHANISM FOR TYPEWRITERS Filed June 21, 1949 IN VEN T0125 .1900; F 6/5551.

Patented Sept. 30, 1952 2,612,252 1 TYPE'BAR-RELE-ASING MEGHANISMFOR.

Adolf Giss'elf TYPEWRITERS; Oberursel, and Ernst Renter,

OlierursP-Bommersheim, Germany, assignors to Torp'edo -Wcrke Aktiengesellschaft, Fahi r'ltdenfund';Schreibmaschinen, Frankfurt-Maine Rodelheim Germany,.a firm Amflibat'ion' June .21, 1949,.Seria1 No. 100,464. InFran'ce JulylfG, 1"9'48'v I wl ien the keys of typewriters are ineorrectly struck; or struck in too rapid succession', i't fre' quently occurs that two ormore type bars become jammed and-locked at or in-the neighbor hood of the point'of impact with the platen.

one of the existing key lovers of the machine, I

The invention isbased upon the fact that the universal bar, which is actuated-by the type bars upon, or shortly before, theirimpact with the platen; for the purpose of tripping the escape ment fortheforward feed of the carriage, has already been rocked at least partially from the initial position when the type bars become jammed shortly before reaching the point of impact.

It is a further object of the invention to take advantage of the return into the initial position of the universal bar to release the jammed type bars, by utilising, in a simple manner, the relative movement of certain parts of the typewriter that result from the depression of the shift key.

Another object of the invention is to provide, on an existing part of the machine, between which part and the universal bar there occurs a relative movement during the shift movement, a stop past which the universal bar, or a member moving therewith, is guided during the shift operation and is thus returned into the initial-position. By this return of the universal bar into the initial position, the jammed bars are forced back through such a distance that they are freed one from another and fall back freely into their respective initial positions. I

The invention will hereinafter be described with reference to the embodiment illustrated by way of example in the accompanying drawing, which shows in side elevation those parts of the operating mechanism of a typewriter of the basket-shift type which are employed in carrying the invention into effect.

The type bars 2 pivotally mounted in the usual manner on the pin I in a vertically displaceable segment frame or basket are provided in the known manner with a striking nose 3 which, when the type bars reach the point of impact with the platen, rock the universal bar 4 from the initial position shown in dot-and-dash lines into the tripping position. The universal bar 4 guided on ,4 Claims. (o1. 197-22) the basket is articulated by means of" rearward-1y extending arms 5' to rocking levers G, 9 which are rockably mounted onthe pins 1 of the segment.

frame or basket. These parts of the machine-are all accommodated by the segment frame 'or'basket 8',- and thus-take part in the shift movement'forf the impression of large characters, the shift movement taking place vertically as indicated by" the arrow A. By the impact of'thetype, the-parts 4 and 6 are moved from the-initial pcsition'show'n in dot-and-dash lines into the position-"shown in A coupling rod I 0 connecting" therocking arms 5 also takes part in this rocking continuous lines.

movement of theparts 4 'and't.

Abearing member I2 supporting a pawl- F3 is screwed to the machine-frame H. The pa-w-l id is held by a spring in the'ini-tial position shown;- in which its end extension I4 bears against "the In this position, the releasing I that is to say, the type bar segment is shifted downwardly with the parts 4, 6 and 8 articulated thereto, the coupling rod I0 encounters the nose of the pawl I3 and is returned towards the type bars, into the initial position by the nose I5. The other tripping members also take part in this movement together with the universal bar. The universal bar 4 thus presses against the noses 3 of the type bars 2 and rocks them through such a distance that they are released from the jammed position. i

As will be seen from the drawing, the pawl l3 does not influence the coupling rod in its initial position, so that the shift movement of the segment is not interfered with. If type bars become locked in the shift position, the shift key is released and re-depressed. When the shift key is released and the parts 4, 6 and 8 thus move in the upward direction, the pawl I3 can yield, and the jammed type bars are then freed when the right-hand or left-hand shift key is again depressed.

Numeral l6 denotes the platen, I8 the intermediate link pivotally connected at its upper end to segment or basket 8 and at its lower end to the shift key lever I9.

The provision of the pawl I3 on the machine In the case of typewriters of the carriage-shift type, that is to say, of the type in which, not the type bars with the segment, but the frame supporting the carriage, is moved vertically, to effect the impressions of the large characters, the pawl is provided on the carriageframe and then guided past the coupling rod in or other suitable part of the universal bar during the shift movement.

The principle of the invention is applicable to all typewriters provided with a shift arrangement, the releasing pawl l3 being provided in association with a part suitable for returning the universal bar andthe tripping system into the initial position, according to the particular construction of the said parts. provided in association with the coupling rod ill, in which case the said pawls are each arranged to engage close to the two rocking levers 6 in order,

to prevent buckling of the parts [0, 6 and 4 during the releasing movement. 7

We claim: I 1

1. In a typewriter, the combination comprising a frame, a type bar segment shiftably mounted in the frame and normally occupying a first position, key means operable to shift the type bar segment to a second position, a plurality of type bars pivoted to the segment, a universal bar movably mounted in the segment and moved in the same by any one of the type bars approaching the point Moreover, two pawls may be shifting to the second position for thereby rock ing the rockable means and moving the universal bar from operativeto inoperative position and thereby releasing-jammed itypebars, 3;

v2. The "combination according to claim 1, wherein the universal bar includes rearwardly extending arms and the rockable means includes rockable members each articulated to an arm and a coupling bar connecting the members and 10' engaging the last mentioned means during shifting of the segment.

13. The: combination according to claim 2, wherein the frame includes a bearing member rigid therewith and the means mounted on the frame and engaged by the rockable means is a lever urged against the bearing member and having a" releasing nose engaged by the coupling bar during shifting of the segment.

4. The 7 combination according to claim 1, wherein the frame includes a bearing member rigid therewith and the last mentioned means is a lever urged against the bearing member and having a releasing nose engaged by the rockable means during shifting of the segment.

ADOLF GISSEL. ERNST REU'IER.

REFERENCES CITED The following references are of record in th file of this patent:

UNITED STATES PATENTS 123,893 Austria of 1931 

